Fire-box for boilers



(No Model.)

J. T. OORBBTT.

FIRE BOX FOR BOILERS.

No. 340,102. Patented Apr. 20, 1886.

l m 'nu IlNrTnn STATES PATENT OFFICE.

JOHN T. CORBETT, OF AURORA, ILLINOIS.

FIRE-BOX FOR BOILERS.

LPECIFECATION forming part of Letters Patent No. 340,102, dated April20, 1886.

Application tiled March E2, 1886. Serial No. 193,737. (No model.)

T0 c/,ZZ whom t may concern:

Be it known that I, JOHN T. CoRBE'rr, of Aurora, in the county of Kaneand State of Illinois, have invented certain new and useful Improvementsin 'Fire-Boxes for Boilers and in Parts Connected Therewith; and I dohereby declare that the following is a full, clear, and exactdescription of the invention, which will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying' drawings, and to letters of reference markedthereon, which form a part of this specification.

My improvements relate to the fire-box and its connection with theboiler, and will clearly appear from the following description.

'l have shown my invention as applied to a magazine-boiler, and in whichthe magazine extends in a curve from the fire box or pot upward aroundthe exterior of the boiler, as in my application for United StatesLetters Patent, Serial No. 185,284, filed December 10, 1885.

In the drawings, Figure l is a cross-section through theirebox,magazine,and horizontal boiler; and Fig. 2 a verticallongitudinal section, showing also the connection of the tirebox withthe boiler.

The fire-box A is hollow, having within it an ample waterspaee,b. It ispreferably made of cast-iron, but may, if desired, be made ofboiler-plate and riveted, and it is, as shown, closed at all sides, top,and bottom, the waterspace b having direct connection with the water inthe boiler by means of the pipes O C, one on each side of the boiler.

The tire-box is preferably made circular, but it may be square or of anyother suitable shape, or conformable to or adapted for the shape of thefurnace.

The re-box I prefer to make with a projection or flanged portion, d d,which may also be hollow, as shown, to increase the inclosedwater-space, and this permits it to be readily set in the brick-work ormasonry of boilers of various constructions, the fire-box being anindependent piece of the structure, and not integral with or forming apart of the walls of the furnace or boiler, and the grate bar or bars orthe support for the same may, by reason of the form of the fire-box, beattached to and held by it, as shown at c e in Fig. l.

In the construction shown the inner edge of the top of the fire-box, asseen atff, forms a. rest for the end ol the curved part of the magazinesG G. In some cases only one magazine G may be made, extending up at oneside only of the boiler.

The large water-holding space b, in conjunction with the largeheating-surface of this fire-pot in direct proximity to the burningfuel, largely increase the steam-generating capacity of the boiler, andthese, through the agency of the pipes C C, aord means whereby aconstant and perfect circulation of water is at all times secured. Itwill also be readily understood that besides these advantages the waterwithin this fire-box (which may be considered as an endless tube)affords a protection against the destructive tendency of the fire, andrenders the lireebox as durable as the boiler itself. The magazines whenemployed also further increase the steaming capacity of the boiler.

Other forms of fuel-supplying magazine or magazines may be used, so longas it or they communicate directly with the fire-box, and the latter, asshown, is located under the boiler, and the pipes O, as 'also themagazine or magazines G, are inclosed within the masonry or outer walls,substantially as shown. The heat generated is therefore almost e11-tirely utilized, having but little opportunity to escape.

I claiml. In combination with a horizontal boiler having afuel-supplying magazine communieating directly with the fire-pot, awaterholding fire-box located under the boiler, and closed at all sides,and communicating by pipes inclosed within the masonry or outer wallswith the water in the boiler, all substantially as set forth.

2. In combination with a horizontal boiler having a fuel-magazinecommunicating by curved feedingpassages directly with the firepot, aspacious water-holding fire box or pot and hot-water pipes C C, eachconnecting the upper` part of such water-holding box with the water inthe boiler, all substantially as and for the purposes set forth.

3. A water re-pot constituting a spacious 5,hol1ow water-chamber closedat all sides, provided with an extension or projection, and suspended orsupported thereby in the masonry or casing of the boiler, combined withtwo similar and inclosed tubes, C C, one on each side, severallyconnecting such water- Io chamber with the water-space in the boiler.

JOHN T. CORBETT.

Witnesses: Y

E. T. PRINDLE, CHARLES L! ALLEN.

